6533b827fe1ef96bd12859f9
RESEARCH PRODUCT
Influence of BaTiO<inf>3</inf> on synthesis and structure of lead-free ceramics based on KNN
Maija AntonovaIlze SmeltereBarbara Garbarz-glosAnna KalvaneAndris SternbergM. Livinshsubject
Phase transitionMaterials scienceDopantvisual_artX-ray crystallographyvisual_art.visual_art_mediumAnalytical chemistrySinteringMineralogyCeramicCrystal structureMicrostructureStoichiometrydescription
In the present work lead-free compositions with a stoichiometric formula (1−x)(K 0.5 Na 0.5 )Nb 1−y Sb y O 3 -xBaTiO 3 (x=0.01, 0.02, 0.04; y=0.04, 0.07) were produced by solid state sintering method. Manganese oxide MnO 2 was used as a dopant in order to lower the sintering temperatures. The influence of BaTiO 3 on the microstructure, density, mechanical and electrical properties of Sb-substituted KNN ceramics was investigated. X-ray diffraction analysis revieled pure perovskite structure. Microstructural investigation of the ceramics samples showed homogeneous structure with a slightly rounded cubical grain shape. Phase transition temperature T c is shifted to lower temperatures in comparison to Sb-substituted KNN ceramics. Phase transition peak at T c becomes broader indicating the diffuse phase transition.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-07-01 | Proceedings of ISAF-ECAPD-PFM 2012 |